Influence of Sliding Conditions on Pitting Fatigue Strength of Carburized Steel.

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  • 浸炭鋼のピッチング疲労強度に及ぼす滑りの影響
  • シンタン コウ ノ ピッチング ヒロウ キョウド ニ オヨボス スベリ ノ エイキョウ

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Abstract

The influence of sliding conditions on pitting fatigue strength has been investigated. In order to elucidate the influence of sliding conditions, fatigue tests were carried out on various conditions of specific sliding (0∼-82%) and rolling velocity (500∼5000 rpm) with carburized SCr420 Steel rollers. As the results, there were two pitting forms, internal initiation and surface initiation. In the case of 0% specific sliding, internal initiate pitting occurred. The crack initiation depth and the fatigue strength of internal initiation coincided with the values estimated from shear stress and shear strength related Vickers hardness. In the case of -8∼-82% specific sliding, surface initiate pitting occurred. The fatigue strength was related to specific sliding rather than rolling velocity, surface friction coefficient and surface temperature, and the fatigue strength decreased as specific sliding increased.

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